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The island is part of the Chaussée de Sein (The Sein Causeway), a long
stretch of underwater cliffs that constitute a danger for navigation, which
is intense in this part of the Atlantic. In ancient times, the
inhabitants would comb the beaches for goods washed ashore from shipwrecks.
But today, the island and its linghthouses have become a navigational
landmark. The lighthouse shown here has its own power station, which also
provides electricity for the rest of the island.